共查询到19条相似文献,搜索用时 78 毫秒
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文中报导了利用两步不等频共振泵浦Li蒸气,获得了一系列红外受激辐射和串级辐射。文中对受激辐射特性进行了研究。 相似文献
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Peng Zhang 《半导体学报》2024,(4):99-104
Li2MnO3 and Li2RuO3 represent two prototype Li-rich transition metal(TM) oxides as high-capacity cathodes for Liion batteries,which have similar crystal structures but show quite different cycling performances.Here,based on the first-principles calculations,we systematically studied the electronic structures and defect properties of these two Li-rich cathodes,in order to get more understanding on the structural degradation mechanism in Li-rich TM oxide... 相似文献
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D. M. Fleetwood R. A. ReberJr L. C. Riewe P. S. Winokur 《Microelectronics Reliability》1999,39(9):1323
Thermally stimulated current (TSC) techniques provide information about oxide-trap charge densities and energy distributions in MOS (metal-oxide-semiconductor) capacitors exposed to ionizing radiation or high-field stress that is difficult or impossible to obtain via standard capacitance–voltage or current–voltage techniques. The precision and reproducibility of measurements through repeated irradiation/TSC cycles on a single capacitor is demonstrated with a radiation-hardened oxide, and small sample-to-sample variations are observed. A small increase in E′δ center density may occur in some non-radiation-hardened oxides during repeated irradiation/TSC measurement cycles. The importance of choosing an appropriate bias to obtain accurate measurements of trapped charge densities and energy distributions is emphasized. A 10 nm deposited oxide with no subsequent annealing above 400°C shows a different trapped-hole energy distribution than thermally grown oxides, but a similar distribution to thermal oxides is found for deposited oxides annealed at higher temperatures. Charge neutralization during switched-bias irradiation is found to occur both because of hole-electron annihilation and increased electron trapping in the near-interfacial SiO2. Limitations in applying TSC to oxides thinner than 5 nm are discussed. 相似文献
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回音壁模式光学微腔是一种研究非线性光学现象的理想平台。在1 550 nm波段下成功实现了在CaF2晶体微腔中产生五阶级联的受激布里渊散射激光。所用的CaF2晶体微腔直径为12.6 mm,同时有着超高的品质因子,最高可以达到 。实验中发现,当大尺寸晶体腔与绝热的锥形光纤进行耦合时,能够激发出多个谐振模式,保证了能够方便地选择不同的谐振波长来匹配受激布里渊散射频移。可以消除在匹配微腔的自由频谱范围和布里渊频移时对微腔尺寸精准控制的需要。为了解决在微腔和波导耦合时的环境震动影响,还设计了一个可以精密耦合调节的封装平台,可以保证谐振腔和波导稳定的在氮气保护气体氛围中被耦合密封起来。产生的级联布里渊激光和设计出的稳定封装平台可以用于后续的应用开发,例如多波长布里渊激光器产生和基于布里渊激光的陀螺仪研发等。 相似文献
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本文报道在N_2中添加SF_6和三乙胺显著增加3371A的输出;给出不同的SF_6含量与3371(?)和3577(?)输出的变化关系;指出SF_6对B~3Π_g(ν=1)的转动能级的强烈影响。 我们是在一台Blumlein电路快放电激光器上进行N_2添加SF_6和三乙胺的实验研究的。激光腔体尺寸为6×6×100厘米,转输线储能电容和脉冲形成电容量均为27000微微法。“T”形激光电极的阴极上下面附近分别装置一根铜棒,即采用双铜棒预电离。工作电压是18千伏。 研究了3371(?)和3577(?)受激辐射输出功率与混合气SF_6/N_2比值之间的关系,工作气压保持在80托。当SF_6/N_2<1,即在N_2中添加少量SF_6时,3371A的输出功率迅速增加,直 相似文献
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我们研制的HGL-81型CO_2激光器输出功率达2千瓦以上,连续工作时间2小时以上,输出功率稳定度小于±5%,电光转换效率大于11%。 HGL-81型CO_2激光器采用的总体技术方案是工作气体快速流动,横向电激励、高气压、多针-板自持放电。工作气压范围为50~300托。提高工作气压的好处是:激光输出功率随气压增加而增加,有利于长时间、全封闭稳定工作,工作过程中不需要补充新鲜气体,纵模稳定;气体质量流量大,气体温度低等。提高工作气压带来的主要问题是辉光放电的不稳定性。我们采用多针-板放电结构较好地解决了这个问题。 相似文献
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Si/SiO2 superlattices that exhibit intense luminescence properties were fabricated by remote plasma enhanced chemical vapor deposition. (RPECVD) and subsequent rapid thermal annealing for silicon crystallization. The effects of charge carrier confinement like blue shifting of the PL spectra and intensity increase with decreasing Silicon quantum well thickness are observed in low temperature photoluminescence experiments. The Si/SiO2 interface quality is calculated from capacitance voltage (CV) measurements on metal oxide semiconductor teststructures showing excellent layer and Si/SiO2 interface properties. The Si crystallization process is investigated and analyzed by Raman and transmission electron microscopy. Decreasing the Si quantum well thickness to 2 nm leads to light emission at room temperature. 相似文献